CN209545308U - A kind of noise-proofing ac motor - Google Patents
A kind of noise-proofing ac motor Download PDFInfo
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- CN209545308U CN209545308U CN201920566876.0U CN201920566876U CN209545308U CN 209545308 U CN209545308 U CN 209545308U CN 201920566876 U CN201920566876 U CN 201920566876U CN 209545308 U CN209545308 U CN 209545308U
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- noise
- motor
- rear end
- fan housing
- end cap
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- 230000007246 mechanism Effects 0.000 claims abstract description 46
- 238000004804 winding Methods 0.000 claims abstract description 31
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 4
- 230000009467 reduction Effects 0.000 claims abstract description 3
- 238000013461 design Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 4
- 230000020347 spindle assembly Effects 0.000 abstract description 2
- 238000004080 punching Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 10
- 230000006872 improvement Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910000976 Electrical steel Inorganic materials 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- Structures Of Non-Positive Displacement Pumps (AREA)
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- Motor Or Generator Cooling System (AREA)
Abstract
The utility model relates to a kind of noise-proofing ac motors, including base, rotor core, rotor windings, stator winding and stator core；One end assembly connection drive end bearing bracket of the base；The other end assembly connection protection mechanism of the base, the protection mechanism is to quick assembling motor, reduction motor noise；Air draft mechanism, the air draft mechanism and armature spindle assembly connection are installed, assembly connection is to guarantee that air draft mechanism works normally, shortens the length of the armature spindle at the inside center of the protection mechanism；The outer wall of the rotor core offers cyclic annular skewed slot, and the section of the skewed slot is V-shaped, and the skewed slot of V-shaped is to reduce motor noise；The noise-proofing ac motor can be shortened assembling flow path, improve installation speed, be eliminated the connection gap of rear end cap and fan housing, improve motor overall stability, reduce motor noise by the rear end cap and fan housing of integrated design.
Description
Technical field
The utility model relates to a kind of noise-proofing ac motors, belong to technical field of motor manufacture.
Background technique
Phase asynchronous ac motor is a kind of motor for leaning on while accessing the power supply of 380V three-phase alternating current, due to three
The revolving speed of the rotor of phase asynchronous motor and stator rotating excitation field in the same direction, different is at rotation, and there are revolutional slips, so
It is threephase asynchronous；The revolving speed of three-phase asynchronous motor rotor be lower than rotating excitation field revolving speed, rotor windings because with magnetic field
Between generate electromotive force and electric current there is relative motion, and generate electromagnetic torque with magnetic field interaction, realize energy conversion.
The application range of phase asynchronous ac motor is very extensive, when the electric current of motor is larger, the noise of motor
Also very much, current electric vehicles be will increase in order to guarantee that vehicle bass is run, have higher requirement for motor noise, and
Current motor noise decibel is larger, is unable to satisfy requirement of the electric vehicle for low noise.
Utility model content
The utility model is in view of the deficienciess of the prior art, provide a kind of noise-proofing ac motor, particular technique
Scheme is as follows:
A kind of noise-proofing ac motor, including base, rotor core, rotor windings, stator winding and stator core；
One end assembly connection drive end bearing bracket of the base；The other end assembly connection protection mechanism of the base, the protection mechanism are used
With quick assembling motor, reduce motor noise；Air draft mechanism, the exhaust blower are installed at the inside center of the protection mechanism
Structure and armature spindle assembly connection, assembly connection is to guarantee that air draft mechanism works normally, shortens the length of the armature spindle；It is described
The outer wall of rotor core offers cyclic annular skewed slot, and the section of the skewed slot is V-shaped, and the skewed slot of V-shaped is to reduce electricity
Machine noise.
Preferably, the protection mechanism includes rear end cap and fan housing, and the rear end cap and the fan housing are fixed as one, institute
Rear end cap and the base assembly connection are stated, the inside of the fan housing is equipped with air draft mechanism.
Preferably, the rear end cap be it is mesh-structured, it is mesh-structured with so that air-flow by flowing out to institute in the base
State fan housing.
Preferably, the air draft mechanism includes mounting ring, connecting rod and impeller, and the impeller is set to the interior of the fan housing
Portion is connected with mounting ring by connecting rod at the medial surface center of the impeller, and the connecting rod is through the center of the rear end cap
The inner end at place, the connecting rod is equipped with mounting ring, and the mounting ring, the impeller are respectively arranged on the two sides of the rear end cap.
Preferably, the inner wall of the mounting ring is provided with the limiting slot of annular spread, and the end of the armature spindle is equipped with assembly
Column, the assembles post are embedded in the inside of the mounting ring, and cricoid limited block, the limit is distributed in the outer wall of the assembles post
Position block is embedded in the inside of the limiting slot.
Preferably, the inner wall of the fan housing is equipped with cricoid stop collar, and the outer edge sliding of the impeller is embedded in described
The inside of stop collar.
Preferably, the outer wall of the fan housing is equipped with terminal box, and the terminal box connects connector lug, the wiring by conducting wire
Head is set to the rear end cap close to the inboard wall of base, and the connector lug electrically connects with the rotor windings, the stator winding
It connects.
A kind of production method of noise-proofing ac motor, comprising the following steps:
(1) stator assembles:
Together by stator winding, stator core pressing；
Wound around coil and vacuum paint dipping on stator winding；
By the assembly of assembled stator in base；
(2) rotor assembles:
It gets on the bus in rotor core and processes V-arrangement skewed slot, and armature spindle Excircle machining 0.1mm wave groove；
Armature spindle, rotor core are fitted together；
Rotor after assembling is encased in stator；
(3) outer shell structure assembles；
Drive end bearing bracket, rear end cap and fan housing are made, guarantees drive end bearing bracket, the surface roughness of rear end cap is 0.025~0.8 μ
m；
Air draft mechanism is assemblied in the inside of fan housing, the surface of fan housing is arranged terminal box, installs and connect at the inner wall of rear end cap
The end of a thread；
Rear end cap and fan housing are connected as one composition protection mechanism；
Drive end bearing bracket, protection mechanism are assemblied in the both ends of base, armature spindle and air draft mechanism assembly connection, winding and wiring
Head connection.
Preferably, the stator, rotor are all made of punching annealing process and are made, and punching uses high-speed punching punching, to make
Punching burr control in 0.005mm hereinafter, when punching, constantly rotates silicon steel plate, it is poor to reduce same plate.
As an improvement of the above technical solution, the armature spindle is processed using milling processes.
The utility model has the beneficial effects that can shorten assembling flow path by the rear end cap and fan housing of integrated design, improve
Installation speed eliminates the connection gap of rear end cap and fan housing, improves motor overall stability, reduces motor noise；One
The protection mechanism of body design can shorten the length of armature spindle, the rotational stability of armature spindle be improved, to further reduce
Noise；The skewed slot of V-shaped is to further decrease motor noise.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of noise-proofing ac motor shown in the utility model；
Fig. 2 is rotor spindle structure schematic diagram shown in the utility model；
Fig. 3 connect attachment structure schematic diagram with rotor core for armature spindle shown in the utility model；
Fig. 4 is armature spindle shown in the utility model and mounting ring attachment structure schematic diagram；
Fig. 5 is winding shown in the utility model and connector lug attachment structure schematic diagram.
Appended drawing reference: 1, base, the 11, first connecting plate, the 12, second connecting plate, 2, protection mechanism, 21, rear end cap, 22,
Fan housing, 221, stop collar, 3, air draft mechanism, 31, mounting ring, 311, limiting slot, 32, connecting rod, 33, impeller, 4, terminal box, 41,
Connector lug, 5, drive end bearing bracket, 6, armature spindle, 61, bull stick, 62, assembles post, 621, limited block, 7, rotor core, 8, rotor windings,
9, stator winding, 9a, stator core.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
A kind of noise-proofing ac motor, including base 1, rotor core 7, rotor windings 8, stator winding 9 and stator
Iron core 9a；One end assembly connection drive end bearing bracket 5 of the base 1；
The other end assembly connection protection mechanism 2 of the base 1, the protection mechanism 2 is to quick assembling motor, reduction
Motor noise；
Air draft mechanism 3 is installed, the air draft mechanism 3 connects with the assembly of armature spindle 6 at the inside center of the protection mechanism 2
It connects, assembly connection is to guarantee that air draft mechanism 3 works normally, shortens the length of the armature spindle 6；
The outer wall of the rotor core 7 offers cyclic annular skewed slot, and the section of the skewed slot is V-shaped, V-shaped it is described
Skewed slot is to reduce motor noise.
As an improvement of the above technical solution, the protection mechanism 2 includes rear end cap 21 and fan housing 22, the rear end cap 21
It is fixed as one with the fan housing 22, the rear end cap 21 and 1 assembly connection of base, the inside of the fan housing 22 is equipped with
Air draft mechanism 3；Rear end cap 21 is fixed as one with fan housing 22, may make worker in assembly, no longer needs to first install rear end cap 21,
Fan housing 22 is installed again, assembling flow path can be shortened, improve installation speed, eliminate the connection gap of rear end cap 21 Yu fan housing 22,
Motor overall stability is improved, motor noise is reduced.
As an improvement of the above technical solution, the rear end cap 21 be it is mesh-structured, it is mesh-structured use so that air-flow by
The fan housing 22 is flowed out in the base 1；Improve heat dissipation effect.
As an improvement of the above technical solution, the air draft mechanism 3 includes mounting ring 31, connecting rod 32 and impeller 33, institute
The inside that impeller 33 is set to the fan housing 22 is stated, passes through connecting rod 32 at the medial surface center of the impeller 33 and is connected with mounting ring
31, for the connecting rod 32 through at the center of the rear end cap 21, the inner end of the connecting rod 32 is equipped with mounting ring 31, the dress
The two sides of the rear end cap 21 are respectively arranged on ring 31, the impeller 33；It can be realized quick assembling by mounting ring 31, fill
It can be rotated by 32 impeller 33 of connecting rod with ring 31.
As an improvement of the above technical solution, the inner wall of the mounting ring 31 is provided with the limiting slot 311 of annular spread, described
The end of armature spindle 6 is equipped with assembles post 61, and the assembles post 61 is embedded in the inside of the mounting ring 31, the assembles post 61
Cricoid limited block 611 is distributed in outer wall, and the limited block 611 is embedded in the inside of the limiting slot 311；Limited block 611 is embedding
Enter the bonding strength to limiting slot 311 to improve mounting ring 31 Yu armature spindle 6, so that armature spindle 6 and the rotation of impeller 33 are same
Step is stablized.
As an improvement of the above technical solution, the inner wall of the fan housing 22 is equipped with cricoid stop collar 221, the impeller 33
Outer edge sliding be embedded in the inside of the stop collar 221；Stop collar 221 to impeller 33 carry out limition orientation so that
Impeller 33 rotates more stable, will not shift.
As an improvement of the above technical solution, the outer wall of the fan housing 22 is equipped with terminal box 4, and the terminal box 4 is by leading
Line connects connector lug 41, and the connector lug 41 is set to the rear end cap 21 close to 1 inner wall of base, the connector lug 41 and institute
State rotor windings 8, the stator winding 9 is electrically connected；The outer wall of fan housing 22 is arranged in terminal box 4, can protection mechanism 2 with
When base 1 assembles, the electric connection of winding Yu terminal box 4 can be completed, so that the processing of base 1 is more easy, it is fixed to improve
The assembly efficiency of son, rotor and base.
As shown in FIG. 1, FIG. 1 is the structural schematic diagrams of noise-proofing ac motor shown in the utility model；
The outer wall of armature spindle 6 is arranged with rotor core 7, and the outer wall of rotor core 7 is socketed with rotor windings 8, rotor windings
8 outside is socketed with stator winding 9, and the outside of stator winding 9 is socketed with stator core 9a, and stator core 9a is interior with base 1
Wall fits closely；
It is connected by screw to drive end bearing bracket 5 at one end outer edge flanging of base 1, screw is annularly distributed, and the one of armature spindle 6
End is connected by screw to rear end cap 21 at the other end outer edge flanging of base 1 at the center of drive end bearing bracket 5；Rear end cap 21
It is integrated with 22 seamless welding of fan housing；Armature spindle 6 can be shortened 15~30mm by the protection mechanism 2 of integrated design, improve rotor
The rotational stability of axis 6, to further reduce noise；
The inside of fan housing 22 is equipped with air draft mechanism 3, and air draft mechanism 3 includes mounting ring 31, connecting rod 32 and impeller 33,
Impeller 33 is set to the inside of fan housing 22, and the inner wall of fan housing 22 is equipped with cricoid stop collar 221, and the outer edge of impeller 33 slides insertion
Into stop collar 221, it is vertically equipped with connecting rod 32 at the center side of impeller 33, connecting rod 32 is through rear end cap 21, rear end cap 21
Inner end be equipped with mounting ring 31, the diameter of mounting ring 31 is greater than the diameter of connecting rod 32, mounting ring 31 and 32 assembly connection of connecting rod；
The outer wall of fan housing 22 is equipped with terminal box 4, and terminal box 4 is to wiring.
As shown in Fig. 2, Fig. 2 is rotor spindle structure schematic diagram shown in the utility model；
The surface of armature spindle 6 is equipped with pin, and the end of armature spindle 6 is equipped with assembles post 61, and the diameter of assembles post 61, which is less than, to be turned
The diameter of sub- axis 6, the outer wall vertical of assembles post 61 are equipped with cricoid limited block 611, there are four limited block 611 is set, limited block 611
Length it is identical as the length of assembles post 61, the radius with armature spindle 6 of the sum of radius of the thickness of limited block 611, assembles post 61
It is identical.
As shown in figure 3, Fig. 3 connect attachment structure schematic diagram with rotor core for armature spindle shown in the utility model；
The inner wall of rotor core 7 is provided with the mating groove with pin, so that the bonding strength of rotor core 7 and armature spindle 6 is more
It is high；
The outer wall of rotor core 7 is provided with the skewed slot of annular spread, and the section of skewed slot is V-shaped, compared to traditional " one "
Noise can be directly reduced 4~5 decibels by word skewed slot, " V " word skewed slot.
As shown in figure 4, Fig. 4 is armature spindle shown in the utility model and mounting ring attachment structure schematic diagram；
Assembles post 61 is embedded into mounting ring 31, and the inner wall of mounting ring 31 is set there are four limiting slot 311, and limiting slot 311 is in
Annular array distribution, limited block 611 are embedded into limiting slot 311；So that more convenient when assembling alignment, installation accuracy is more
Height improves assembly intensity.
As shown in figure 5, Fig. 5 is winding shown in the utility model and connector lug attachment structure schematic diagram.
Connector lug 41 connects terminal box 4 by conducting wire, and winding connects connector lug 41 by conducting wire, to complete inside motor
Electrical connection.
The production method of noise-proofing ac motor, comprising the following steps:
(1) stator assembles:
Stator punching production is reduced iron loss, is substantially reduced electromagnetic noise using punching annealing process, using at a high speed in a state of excitement
Piece makes punching burr control in 0.005mm hereinafter, when punching constantly rotates silicon steel plate, and it is poor with plate to reduce, and improves iron core laminated system
Number excludes air vibration in punching；
Stator winding 9, stator core 9a are press fit together；
Wound around coil and vacuum paint dipping on stator winding 9；
By the assembly of assembled stator in base 1；
(2) rotor assembles:
Rotor punching production is reduced iron loss, is substantially reduced electromagnetic noise using punching annealing process, using at a high speed in a state of excitement
Piece makes punching burr control in 0.005mm hereinafter, when punching constantly rotates silicon steel plate, and it is poor with plate to reduce, and improves iron core laminated system
Number excludes air vibration in punching；
It gets on the bus in rotor core 7 and processes V-arrangement skewed slot, and 6 Excircle machining 0.1mm wave groove of armature spindle；Substantially reduce electricity
Motivation vibration and noise；
Armature spindle 6, rotor core 7 are fitted together；
Rotor after assembling is encased in stator；
(3) outer shell structure assembles；
Base 1, drive end bearing bracket 5, rear end cap 21 and fan housing 22 are processed by using NC machining center, described
Drive end bearing bracket 5, the stop portion of the rear end cap 21, endface are that a feed is process；To improve each joint face
Machining accuracy guarantees drive end bearing bracket 5, the surface roughness of rear end cap 21 is 0.025~0.8 μm；So that each binding face is more flat
It is whole, the gap of joint face is eliminated, to improve the connective stability of motor, reduces vibration, and then reduce motor noise；Armature spindle
6 are processed using milling processes, eliminate the outer wall roughness of armature spindle 6；So that the gap between stator and rotor is highly uniform, have
Effect reduces motor noise and vibration；Bearing is also set to reduce the coaxiality error at both ends, working resistance at work simultaneously
It substantially reduces, also reduces mechanicalness noise；
It is embedded into stop collar 221 in the outer edge sliding of impeller 33, stop collar 221 is welded on the inner wall of fan housing 22, wind
Terminal box 4 is arranged in the surface of cover 22, installs connector lug 41 at the inner wall of rear end cap 21, and rear end cap 21 is passed through armature spindle 6；
Rear end cap 21 and fan housing 22 are connected as one and constitute protection mechanism 2；By rear end cap 21 and 22 seamless welding of fan housing
Together, stop collar 221 and rear end cap 21 fit closely together；
Drive end bearing bracket 5 is inserted into one end of armature spindle 6, then by screw by drive end bearing bracket 5 with it is seamless at the flanging of base 1
It links together, then hand-held protection mechanism 2, assembles post 61 is inserted into mounting ring 31, and the position for adjusting protection mechanism 2 makes
It obtains limited block 611 to be inserted into limiting slot 311, can so complete the assembly connection of armature spindle 6 Yu impeller 33, winding is led to
It crosses conducting wire to connect with connector lug 41, the other end of base 1 is connect with rear end cap 21 finally by screw, completes the dress of motor
Match.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (7)
1. a kind of noise-proofing ac motor, including base (1), rotor core (7), rotor windings (8), stator winding (9) with
And stator core (9a)；One end assembly connection drive end bearing bracket (5) of the base (1)；It is characterized by: the base (1) is another
One end assembly connection protection mechanism (2), the protection mechanism (2) is to quick assembling motor, reduction motor noise；
It is equipped with air draft mechanism (3) at the inside center of the protection mechanism (2), the air draft mechanism (3) and armature spindle (6) fill
With connection, assembly connection is to guarantee that air draft mechanism (3) work normally, shorten the length of the armature spindle (6)；
The outer wall of the rotor core (7) offers cyclic annular skewed slot, and the section of the skewed slot is V-shaped, the skewed slot of V-shaped
To reduce motor noise.
2. a kind of noise-proofing ac motor according to claim 1, it is characterised in that: the protection mechanism (2) includes
Rear end cap (21) and fan housing (22), the rear end cap (21) and the fan housing (22) are fixed as one, the rear end cap (21) with
Base (1) assembly connection, the inside of the fan housing (22) are equipped with air draft mechanism (3).
3. a kind of noise-proofing ac motor according to claim 2, it is characterised in that: the rear end cap (21) is mesh
Structure, it is mesh-structured to use so that air-flow is by flowing out to the fan housing (22) in the base (1).
4. a kind of noise-proofing ac motor according to claim 3, it is characterised in that: the air draft mechanism (3) includes
Mounting ring (31), connecting rod (32) and impeller (33), the impeller (33) are set to the inside of the fan housing (22), the impeller
(33) it is connected with mounting ring (31) at medial surface center by connecting rod (32), the connecting rod (32) is through the rear end cap
(21) at center, the inner end of the connecting rod (32) is equipped with mounting ring (31), the mounting ring (31), the impeller (33) point
Not She Yu the rear end cap (21) two sides.
5. a kind of noise-proofing ac motor according to claim 4, it is characterised in that: the inner wall of the mounting ring (31)
It is provided with the limiting slot (311) of annular spread, the end of the armature spindle (6) is equipped with assembles post (61), and the assembles post (61) is embedding
Enter the inside of the mounting ring (31), cricoid limited block (611), the limit is distributed in the outer wall of the assembles post (61)
Block (611) is embedded in the inside of the limiting slot (311).
6. a kind of noise-proofing ac motor according to claim 5, it is characterised in that: the inner wall of the fan housing (22) is set
Have cricoid stop collar (221), the outer edge sliding of the impeller (33) is embedded in the inside of the stop collar (221).
7. a kind of noise-proofing ac motor according to claim 6, it is characterised in that: the outer wall of the fan housing (22) is set
Have terminal box (4), the terminal box (4) connects connector lug (41) by conducting wire, and the connector lug (41) is set to the rear end cap
(21) close to the base (1) inner wall, the connector lug (41) electrically connects with the rotor windings (8), the stator winding (9)
It connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920566876.0U CN209545308U (en) | 2019-04-24 | 2019-04-24 | A kind of noise-proofing ac motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920566876.0U CN209545308U (en) | 2019-04-24 | 2019-04-24 | A kind of noise-proofing ac motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209545308U true CN209545308U (en) | 2019-10-25 |
Family
ID=68246184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920566876.0U Expired - Fee Related CN209545308U (en) | 2019-04-24 | 2019-04-24 | A kind of noise-proofing ac motor |
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| Country | Link |
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| CN (1) | CN209545308U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921540A (en) * | 2019-04-24 | 2019-06-21 | 安徽皖南新维电机有限公司 | A kind of noise-proofing ac motor and its manufacturing method |
-
2019
- 2019-04-24 CN CN201920566876.0U patent/CN209545308U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921540A (en) * | 2019-04-24 | 2019-06-21 | 安徽皖南新维电机有限公司 | A kind of noise-proofing ac motor and its manufacturing method |
| CN109921540B (en) * | 2019-04-24 | 2024-05-03 | 安徽皖南新维电机有限公司 | Noise-proof AC motor and its manufacturing method |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191025 |
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| CF01 | Termination of patent right due to non-payment of annual fee |